Fig. 4

a A cystic mass was lined by complex papillae of epithelial cells and walled with glial and fibrovascular tissues (H&E, 40×). b The complex papillae of the cyst comprised a single layer of epithelial cells resembling epithelial cells of the choroid plexus tissue and fibrovascular cores (H&E, 200×). c The choroid plexus-like cells were focally positive for GFAP immunostain (Immunoperoxidase staining, 100×)